Submission #672110

#	Time	Username	Problem	Language	Result	Execution time	Memory
672110		sofija6	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	11 ms	3660 KiB

ho_t2

#include <bits/stdc++.h>
#define ll long long
#define MAXN 200010
#define llinf 1000000000
using namespace std;
vector<ll> posj,poso,posi,mino,mini;
int main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n,k;
    string s;
    cin >> n >> k >> s;
    for (ll i=0;i<n;i++)
    {
        if (s[i]=='J')
            posj.push_back(i);
        else if (s[i]=='O')
            poso.push_back(i);
        else
            posi.push_back(i);
    }
    mino.resize(poso.size()+1,llinf);
    mini.resize(posi.size()+1,llinf);
    for (ll i=posi.size()-1;i>=0;i--)
    {
        if (i+k-1>=posi.size())
            continue;
        if (i+1<posi.size())
            mini[i]=min(mini[i+1]+posi[i+1]-posi[i],posi[i+k-1]-posi[i]-k+1);
        else
            mini[i]=posi[i+k-1]-posi[i]-k+1;
    }
    for (ll i=poso.size()-1;i>=0;i--)
    {
        if (i+k-1>=poso.size())
            continue;
        auto it=lower_bound(posi.begin(),posi.end(),poso[i+k-1]);
        if (it==posi.end())
            continue;
        if (i+1<poso.size())
            mino[i]=min(mino[i+1]+poso[i+1]-poso[i],mini[it-posi.begin()]+posi[it-posi.begin()]-poso[i]-k);
        else
            mino[i]=mini[it-posi.begin()]+posi[it-posi.begin()]-poso[i]-k;
    }
    ll ans=llinf;
    for (ll i=0;i+k-1<posj.size();i++)
    {
        auto it=lower_bound(poso.begin(),poso.end(),posj[i+k-1]);
        if (it==poso.end())
            break;
        ans=min(ans,mino[it-poso.begin()]+poso[it-poso.begin()]-posj[i]-k);
    }
    cout << (ans>=llinf?-1 : ans);
    return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:26:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         if (i+k-1>=posi.size())
      |             ~~~~~^~~~~~~~~~~~~
ho_t2.cpp:28:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         if (i+1<posi.size())
      |             ~~~^~~~~~~~~~~~
ho_t2.cpp:35:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if (i+k-1>=poso.size())
      |             ~~~~~^~~~~~~~~~~~~
ho_t2.cpp:40:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         if (i+1<poso.size())
      |             ~~~^~~~~~~~~~~~
ho_t2.cpp:46:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for (ll i=0;i+k-1<posj.size();i++)
      |                 ~~~~~^~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 12 / 12
• Subtask 3: 87 / 87